Improvement in coal-screens



EETCE.

PATENT JONAS LAUBENSTEIN, OF MINERSVILLE, PENNSYLVANIA.

IMPROVEMENT EN C OALmSCREENS.

Specification forming part of Letters Patent No. 341,306, dated February4, 1862.

To all whom it may concern:

Be it known that I, JONAS LAUBENsTEiN, of the borough of Minersville, inthe county of Schuylkill, State of Pennsylvania, have invented a new anduseful Improvement in the Manufacture of Wrought-Iron Screens for theScreening and Sitting of Coal and other Substances; and I do herebydeclare that the following is a full and exact description thereof,reference being had to the accompanying drawings and the letters ofreference marked thereon.

Screens for the screening of coal and other hard substances which haveto be prepared and assorted in pieces of considerable size and in largequantities are non7 rnade of castiron by casting the meshes and segmentsof the proper sizes and shapes, and of Woven Wire in the ordinary mannerof weaving, and

also ot Woven Wire which is first prepared by crimping by a processpatented by one Henry Jenkins in March, 1847. Although cast-iron screensretain the shape of the mesh, they soon become so polished by use on thesurface of Wear that the lumps or pieces of coal or other substances tobe screened slide too easily over the meshes and are carried for- Wardso quickly that the sizes are not sutticiently and properly separated.This evil is so great that notwithstanding their superior durability buta small number of these screens are used. In screens Where the Wire ofwhich they are made has been merely woven into shape Without anyprevious preparation the meshes soon lose their uniformity of shape andthe coal or other substances prepared becomes irregular is- Dize and thescreen useless for the purpose intended. In screens made by crimping theWire previous to Weaving, as made under the patent of Henry Jenkins, theobjections to the screens manufactured by both the other methods abovementioned are to a certain extent avoided. The coal does not slip orslide so easily as in a cast-iron screen, and the meshes do not becomeirregular as quickly or as easily as in screens made of Wire merelyWoven Without any previous preparation; but these evils dov still existin screens prepared under that patent to a considerable extent. Thesmooth surface of the Wire Will permit the coal in some degree to slipor slide over the-meshes and not be turned or rolled by them, which isthe motion best adapted tothe proper preparation of coal, and the largemass of material passed over such screens at considerable speed soonmakes the Wire forming the meshes slide on the round point of contactfrom onesixth to one-eighth of an inch, and the value of the screen isat once impaired.

My improvement in the manufacture of screens consists, first, in the useof square Wrought-iron rods either drawn or rolled and of such thicknessas is required, generally from one-eighth to three-eighths of an inchthick. In the methods of making screens either by Weaving alone Withoutany previcus preparation or under Jenkinss patent, as above described,round iron or Wire has always been used, and necessarily so, as thesescreens cannot be made of any other kind; but it Will be seen from thefollowing description of my manufacture of screens that the use ofsquare iron is necessary to obtain the requisites desired.

To enable others skilled in the art of screenmaking to make and use myimproved screens, I will proceed to describe the manner of making them.

The square rods to be used are each of them first notched on an angle orcorner with V- notches, which notches are all made on the same angle orcorner and are placed apart twice the length or size of the mesh. Thesenotches are made by the use of a diamond or V punch A, Figures l and 2,and not by cutting out the metal. A solid piece of iron B, Figs. l and2, some three inches wide, four long, and two thick, has three or fourV-grooves c c c @,Fig. l, cut in it. The rods to be prepared are laid.inthese grooves on an angle or corner. rlhe diamond or V punch is of suchsize as to cover and punch each rod on the block B at one stroke. Theblock, rods, and punch are put in a punch-machine, and the rods are thencut nearly to the plane of the block B, about as seen in Figs. l and 2,say one-third of the thickness of the rod from angle to angle. Thenotches are made accurately of the proper distance apart, and the Workexpedited by the use of a gage on the punch-machine. All the rods usedare pre pared in the same way. It the meshes are to be square, thenotches are made equidistant on the longitudinal and cross rods. lf of arectangular shape, the distance apart of the notches on the cross-rodsand longitudinal rods will of course be made to accommodate to suchshape; and it will be perceived that the shape of the mesh can be easilychanged by making the notches at different angles to the length or lineof the rod. In the ordinary square and rectangular mesh the notch isnecessarily made at right angles to the length of the rod. The rod asprepared'previous to weaving is shown in Fig. 5. After the rods are thusprepared or so prepared by any other of the numerous means which anymechanic can suggest and adapt thereto they are Woven together by handinto the desired shape, and in doing this the rods must be so placedthat all the notches of both the longitudinal and cross rods presentthemselves or face toward the same side of the screen. In Fig. 3 thenotches are all facing upward. Take the rod (Z d in this figure. At ethe rod is notched.

Atfthe notch is in the rod g g, and the rod d d is at this point solid.At the point h the rod d d is notched and the t-op rod remains solid,and the same operation occurs throughout the screen, as is seen in Fig.3, in Which at the point of contact the dotted lines represent the rodcut or notched, and the continuons lines the unnotched part of the rods.The solid or unnotched parts of the rods are thus presented all on theone side and the notched parts of the rod on the other.

In making screens for use the solid side is made the inside or side ofWear. It Will be seen that in this arrangement the angle or sharp cornerof the rod is alone presented to the substances passing over the screen.

In Fig. 4 will be seen an end view of a seotion of the manufacturedscreen after Weaving.

The screen When thus prepared is made in segments or sections, as foundnecessary in the ordinary method.

What I claim as my invention, and desire to secure by Letters Patent,is-

An improved manufactureA of screens for the screening and preparing ofanthracite coal or other coals and hard substances similarly handled andprepared, substantially as above-described.

And I .do not claim as my invention any of the mechanical contrivancesor machines u sed in the making of these screens.

JONAS LAUBENSTEIN.

Vitnesses: Y

HOWELL FISHER, L. LAUBENSTEIN.

